MC68HC08AZ60ACFU MOTOROLA [Motorola, Inc], MC68HC08AZ60ACFU Datasheet - Page 178

• Manufacturer Part Number: MC68HC08AZ60ACFU
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

Monitor ROM (MON)
12.4 Functional description
Advance Information
178
The monitor ROM receives and executes commands from a host
computer.
mode and communicate with a host computer via a standard RS-232
interface.
While simple monitor commands can access any memory address, the
MC68HC08AZ60A has optional ROM/EEPROM read protection
features to prevent external viewing of the contents of ROM/EEPROM
(see
to verify ROM/EEPROM content. Access to the ROM/EEPROM is
denied to unauthorized users of customer specified software with read
protection features enabled. See Security.
In monitor mode, the MCU can execute host-computer code in RAM
while all MCU pins except PTA0 retain normal operating mode functions.
All communication between the host computer and the MCU is through
the PTA0 pin. A level-shifting and multiplexing interface is required
between PTA0 and the host computer. PTA0 is used in a wired-OR
configuration and requires a pull-up resistor.
1. No security feature is absolutely secure. However, Motorola’s strategy is to make reading or
copying the ROM/EEPROM data difficult for unauthorized users
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Mask Options
Execution of Code in RAM or ROM
EEPROM Programming
ROM Security (Read Protection)
EEPROM Read Protection
Figure 12-1
Monitor ROM (MON)
on page 167). Proper procedures must be followed
shows a sample circuit used to enter monitor
(1)
(1)
MC68HC08AZ60A — Rev 0.0
MOTOROLA